Meaning of the profile use flag

[a.b.]

I just noticed the profile use flag for glibc. First I thought it would optimize the library with profiling (-fgenerate-profile and -fuse-profile), but the output never contains one of those flags. Only in the configure part, "--enable-profile" is used. So, what does that flag do?

[nixnut]

/usr/portage/profiles/use.desc says: "Adds support for software performance analysis"
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[a.b.]